Elaidic acid

Trans-9 - octadecenoic acid

Colorless scales

Fixed

0.85 g · cm -3

43-45 ° C

288 ° C ( 133 hPa)

Insoluble in water

Attention

100 mg · kg -1 ( LD50, mouse, i.v.)

Template: Infobox chemical / molecular formula search available

Elaidic acid (from gr elaion, "oil" ) is a monounsaturated fatty acid. The molecule contains a straight chain of 18 carbon atoms, in the middle of which a single double bond is located. Since the two parts of the chain in the trans position depend on the carbon atoms of the double bond, is also spoken by a trans - fatty acid.

The chemical formula is so CH3 -(CH2) 7 -CH = CH-( CH2 ) 7- COOH, the systematic name of Trans -9- octadecenoic acid. The corresponding cis- isomer, which occurs much more frequently in nature, ie oleic acid.

Elaidic acid forms colorless crystals of density 0.85 kg / l, melting at 44 to 51 ° C.

Elaidic acid occurs most frequently in the fat hardening, but smaller amounts are also found in milk fat, beef tallow and other fats of ruminants.

Proof

The detection and assay of elaidic acid is carried out typically by gas chromatography of the methyl ester; supplement can be a separation of the unsaturated isomers with silver nitrate thin layer chromatography.